#include <iostream>
using namespace std;

class Date
{
public:
    // 初始化列表
    Date(int year, int month, int day)
        : _year(year), _month(month), _day(day), _n(1)
    {
    }

private:
    int _year;
    int _month;
    int _day;
    const int _n;
};

int main()
{
    return 0;
}